test(chrome-extension): verify WebRTC session description formatting

[gcoinstash-cmd]

Summary of Changes

• Adds unit test coverage for WebRTC session description exchange in Chrome extension recording pipeline.
• Test suite passed 100% green.

Greptile Summary

This PR adds unit coverage for WebRTC session-description conversion and several shared recorder utilities.

• Verifies offer and answer serialization plus missing-description handling in the Chrome extension.
• Covers recording-mode label heuristics, cancellation classification, and retryable display-capture errors in recorder core.

Confidence Score: 5/5

The PR appears safe to merge because it only adds passing unit coverage and introduces no actionable production or test-suite regression.

The new tests exercise existing WebRTC conversion, recording-mode detection, and error-classification behavior without modifying runtime code or establishing a misleading assertion that affects current supported inputs.

Important Files Changed

Filename	Overview
apps/chrome-extension/src/shared/webrtc.test.ts	Adds focused tests for converting offer and answer descriptions and rejecting a missing description; no actionable defect found.
packages/recorder-core/tests/recorder-utils.test.ts	Adds coverage for recording-mode detection and capture-error classifiers without changing production behavior; no actionable defect found.

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